Saw-guide for band-saw mills



'um Model.) I z-sheetssheet i.' `DE WITT C. PRBSCOTT. SAW GUIDE POR BAND SAW MILLS.

No. 426,684. PatentedA'pn 29, 1890.

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(No Model.) 2 sheetst-Sheet' 2.' vDE WITT G. PBBSCOTT.

SAW GUIDE FOR BAND` SAWY MILLS.

Patented Apr, 29, 1890.

UNITED STATES PATENT OFFICE.

DE WITT CLINTON PRESCOTT, OF MARINETTE, WISCONSIN.

'SAW-GUIDE FoR'BAND-sAw MILLS.

SPECIFICATION forming part of Letters Patent No. 426,684, dated April 29, 1890.

Application filed January 9,1888. Serial No. 260,240. (N o model.)

To a/ZZ whom it may concern.-

v Be it known that I, DE WITT CLINTON PRES- COTT,a citizen of the United States, residing at Marinette, in the county of Marinette and State of Visconsin, have invented a certain new and useful Improvement in Saw-Guides for Band-Saw Mills, which is fully set forth in the following specification, reference being had to the accompanying drawings, in Which- Figure l is an elevation of a portion of a band-saw mill having my improved saw-guide applied thereto; Fig. 2, a rear elevation of the upper guide; Fig. 3, a plan section taken on the line l l of Fig. 2; Fig. 4, a side elevation of the same; Fig. 5, a plan view, partly in section; Fig. 6, a sectional View taken on the line 2 2 of Fig. 5; Fig. 7, a sectional View taken on the line 3 3 of Fig. 5; Fig. 8, a view similar to Fig. 4 of the lower guide, and Fig. 9

a plan view of the lower guide.

Like letters refer to like parts in all the ligures of the drawings.

My invention relates to saw-guides forbandsaw mills, and has for its object to provide guides for supporting and guiding the saw, which shall be adjustable in such manner as to enable them to accomplish their work with the highest degree of efficiency.

To these ends my invention consists in certain novel features, which I will now proceed to describe, and will then particularly point out in the claims.

In the drawings, A represents a portion of the framing of a band-saw mill provided with a vertically-adj ustable arm A for supporting the top guide, and with a fixed arm A2 for supporting the bottom guide. These parts may be constructed in any approved manner and form in themselves no part of my present invention. Each arm is provided with a way a, upon which is mounted the member B,

which forms the base of the guide proper.

The two guides are arranged the one above the log or other article to be operated upon and the other below the same, the former forming the top guide and the latter thebottom guide. These guides are identical so far as the main features of their construction are concerned, differing only in certain details.

I will therefore proceed. to describe the construction of the top guide, it being understood that the same description is in the main shown more particularly in Fig. 3 of the draw' ings.

C represents a block, which is mounted upon the bottom plate B of the base B, and which is provided with a curved groove c to receive the rib b. The block C is adjustable upon the base B, so as lto vary its angley with relation to the same by moving it outward or inward thereon, since it is obvious that, owing to the curvature of the rib b any such movement will cause a variation in the angular relation of the two parts. To effect this adjustment, I employ a bolt B3, mounted in a lug b2 on the base B and passing loosely through a similar lug b3 on the block C. Nuts b", mounted on the bolt B3 on each side of the lug b3, servev to effectuate the adjustment in an obvious manner. 1

In order to secure the parts after adjustment, I employ a bolt C', which passes up through the base B and through the rib b vthereonextending upward through the block C, which is slotted, as shown at c A clamping-nut C2 and washer c2 serve to clamp the block C firmly to the base B after adjustment, while the slot c permits the parts to move upon each other during the operation of adjusting them.

In the front face of thel block C there is formed a recess C3, which is open at that end adjacent to the saw, and in this recess there is arranged an arm D. This arm is adjustable longitudinally within the recess, and for effecting this adjustment I employ a bolt D', secured to theA arm D and extending through the wall c3 of the recess C. yNuts d are mount ed on the bolt D on each side of the wall c3, and serve, in anv obvious manner, to effect the longitudinal adjustment of the arm D,

In order to clamp the arm in position after adjustment, there is formed in the said arm a slotcl, and a bolt D2, mounted in the block C, extends through. this slot and is provided with a clamping-nut d2 and washer (Z3, by means of which the said arm may be clamped rmly in position after adjustment.

The arm D tapers slightly from its inner to its outer end, as shown in Fig. 6 of the drawings, audits outer end is vertically adjustable to vary its angle with relation to the block C by means oi' adjusting-screws D3,

which bear upon the same at top and bottom. At the outer end of said arm there is formed on the front face thereof a way (Zt, upon which the inner cheek-piece E of the guide is mounted. This cheek-piece is adjustable upon this way, being provided with an adjusting-bolt e, which passes through a lug (Z5 on the arm D, and is provided with adjusting-nuts e on each side of said lug, as clearly shown in Figs. 3 and 5 of the drawings.

At its outer end the v arm D is provided with a hemispherical socket D, and the outer cheek-piece E is provided with a corresponding heinispherical boss E2, which fits wit-hin said socket. The boss E2 is apertured at its crown, as shown at c2, and a bolt E, mounted in the arm D, extends outward through the said aperture, which is of considerably7 greater diameter than said bolt. The boss E2 is hollow, and in the hemispherical socket formed j by this hollow in the face of the boss there is arranged a washer E4, litting snugly on the bolt and having a hemispherical inner face to it the outer face of the boss. The outer face of this washer is fiat, and a clampinging-nut c3, mounted on the bolt E3 outside of the washer, serves to secure the several parts together. It will be seen that the construction just described forms a species of universal or ball-an d-socket joint, by means of which `the outer cheek-piece is connected to the arm D.

Thefeatures of construction just described are common to both the top and bottom guide. The guides differ, however, in the construction 'of the cheek-pieces and in the location of the saw-supporting roller. In the top guide these parts are constructed and arranged as follows: Each of the cheek-pieces E and E is provided with a downward extension c", and a facing E, ol' vulcanized fiber or other suitable material, is mounted on the inner face of each cheek-piece. This facing is preferably, extended along `that portion of the inner face adjacent to the front and top edge thereof, as

` shown in dotted lines in Fig. 4, the facing being omitted from the remaining surface. The Saw-supporting roller is mounted in the following manner: The arm D is provided at the bottom of its outer end with a way f, eX.- ytendingfrom front to rear, and inthis way is mounted the roller-support F, which is adjustable longitudinally thereon. This support is provided with a longitudinal slot f', and a bolt F', mounted in the arm D, extends downward through said slot, and is provided on its projecting end with a clamping-nut f2, by means of which the support maybe clamped in position on the way after adjustment. The support is provided with a forwardly-extending lateral arm F2, and on this arm the roller F3 is mounted by means of a bolt f3, which forms the axis of the said roller.

The supporting-roller of the bottom guide is mounted in the same manner asis the roller of the top guide, its location being, however, different. As shown in the drawings, the roller of the bottom guide is mounted above the arm and cheek-pieces, the way f being formed on the top of the end of the arm D, instead of on the bottom. The cheek-pieces E and E of the bot-tom guide are provided with an upward extension e5, in place ot the downward extension e4 of the top guide lcheekpieces. The facing of these cheek-pieces extends upward along the front edge of each lcheek-piece and then rearward along the top edge of each extension e5, Where it terminates. `lt begins again at the bottom of the extension e5 and extends rearward, as shown, almost, but not quite, to the line of the roller. By reason of this construction there is a space left at the point e, where the inner faces of the cheek-pieces are not provided with a facing, and where, consequently, there is a clear space between the face of the saw and the `faces of the cheek-pieces, thus forming an aperture, the purpose of which will be herefinafter pointed out. The cheek-pieces of the fbottom guide are also provided with dustchutes G, which, beginning at the rear upper Icorner of the extensions e5, extend forward and downward, and at the Sametime expand llaterally, `as shown in Fig. 9, terminating at 1the front of the guide. l H represents a guard or shield pivoted on the arm A2, and capable of being swung down tinto the position shown in Fig. l of the drawings to cover and protect the lower guide. p I represents the band-saw, which passes `down between the cheek-pieces of the guides v`in the usual manner.

The operation of the guides is as follows:

-The band-saw being properly strained be- -tween the upper and lower wheels, and the ,upper arm A2 being adjusted to the desired height, the base l may be adjusted to the vfront or rear, in order to bring the guides as 1a whole into proper relative position with the saw. The adjustment of the block C upon the base B adjusts simultaneously the angle Iof both cheek-pieces of the guide, so that the said cheek-pieces will be in proper parallelism with the saw-blade so far as the lines extending from front to rear in a horizontal plane are concerned. Both `cheek-pieces may be simultaneously adjusted in and out by adjusting the arm D in and out upon the |`block C, and their parallelism with the saw, 4so far as the vertical lines are concerned, is obtained by tilting 'the said arm D up or down, as desired, by 'means ofthe srews D3.

IOO

The outer cheek-piece E may of course be brought into a position of absolute parallelism to the inner cheek-piece through the medium of the ball-and-socket joint, which connects it to the arm D, this adjustment being independent of the adjustment of the cheekpiece E. Moreover, the distance between the cheek-pieces may be varied as desiredbyadjusting the inner cheek-piece E in or out upon the arm D through the medium of the mechanism provided forthat purpose. The supporting-roller may also be adjusted up'to its proper position to accommodate saws of different widths, while the adjustment of the cheek-pieces toward and from each other will accommodate saws of different thicknesses. It will thus be seen that by means of the various adjustments hereinbefore referred to the cheek-pieces may be brought into such a position with relation to the saw as to accomplish their work with the highest efficiency. The facing E5 prevents, of course, the contact of the saw with the metal of which the cheekpieces are composed. The arrangement of the facing on the lower guide, by which an aperture is left at e", provides a clearancespace at this point, through which the sawdust which may adhere to the saw can pass down and out. The chutes G, however, dispose of the greater portion of this dust, collecting the same from the saw and carrying it forward clear of the guide, thereby preventing clogging of the parts.

It is obvious that various modifications in the details of construction and arrangement of the parts may be made without departing from the principle of my invention, and I therefore do not wish to be understood as limiting myself'strictly to the precise details hereinbefore described, and shown in the drawings.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l: ln a band-saw guide, thecombination, with the supporting-arm and the inner cheekpiece mounted thereon, said supporting-arm being provided with a hemispherical socket at its outer end, of the outer cheek-piece provided with a corresponding hemispherical boss to fit said socket, and the bolt connecting the two, substantially as and for the purposes specilied.

2. ln a band-saw guide, the combination, with the supporting-arm D and the inner cheek-piece E, mounted thereon, said arm being provided with the hemispherical socket D4, of the outer cheek-piece E. provided with a hollow hemispherical boss E2 to fit the socket D4, said boss having an enlarged aperture e2, the bolt E3, passing through said aperture, the wash er E4, having a hemispherical inner surface to fit the boss, and the clamping-nut es, substantially as and for the purposes specified.

3. In a band-saw guide, the combination, with the arm D and the outer cheek-piece E',

connected to said arm by a ball-and-socket joint, of the inner cheek-piece E, mounted in suitable ways on the said arm and adjustable toward and from the outer cheek-piece, substantially as and for the purposes specified.'

4. In a band-saw guide, the combination, with a suitable supporting base or block provided with a recess open at its end, of the supporting-arm D, arranged in `said recess, carrying thecheek-pieces and tapering gradually from rear to front7 and adjusting-screws bearing on said arm at the front of the recess at top and bottom to tilt the same, substantially as and for the purposes specied.

5. In a band-saw guide, the combination, with the base B, of the block C, mounted thereon and adjustable to various angles with relation thereto on a curve, the center of which is about coincident with the front line of the saw-teeth, and the cheek-pieces and their supporting-arm connected to said block, ubstantially as and for the purposes Speci- 6. In a band-saw guide, the combination, with the base B, provided with the curved diagonal rib b', of the block C, provided with a corresponding groove c, adjusting and clamping screws connecting the block and base, and the cheek-pieces and their supportingarm connected to the block, substantially as and for the purposes specified.

7. In a band-saw guide, the combination, with the base B, of the block C, adjustable angularly thereon on a curve, the center of which is about coincident with the front line of the saw-teeth, and the arm D, carrying the cheek-pieces, mounted on the block C and adjustable in and out with relation to said block, and suitable adjusting and clamping screws for moving and securing said arm, substantially as and for the purposes specified.

8. In a band-saw guide, the-combination, with the cheek-pieces independently adjustable with relation to each other, of supporting devices for said cheek-pieces, substantially such as described, whereby both cheekpieces may be simultaneously adjusted -on the guide arm and independently of any movement of said arm to various angles both IOO IOS

IIO

vertically and horizontally with reference to the plane of the saw, and also in and out and forward and back with reference to the saw,

substantially as and for the purposes specitied.

DE wirr cnNroN rnnscorr.

Witnesses:

JOHN J. ANDREW, W. P. MARS).

9. In a band-saw guide, the combination, 

